I suspect that an experienced VFR pilot could fly an approach in zero vis using synthetic vision down to 150ft no problem.
I think that would be a ridiculously foolish notion.
Setting aside an approach to landing, the VFR pilot in instrument conditions faces the daunting task of keeping the airplane upright, let alone flying an approach. "Synthetic vision" is good and well, but I've seen a number of pilots with decent situational displays lose control of the airplane in straight and level flight, to say nothing of simple turns, or maneuvering.
We've already got idiots letting parachutes lure them into flying situations where they have no business. Let's not allow the same latitude to a pretty display.